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Form 1040X is used to correct forms 1040, 1040A, 1040EZ, 1040NR, or 1040NR-EZ. File Form 1040X only after you have filed your original return. Generally, Form 1040X must be filed within 3 years after the date you filed the original return or within 2 years after the date you paid the tax, whichever is later. A return filed early is considered filed on the due date.